KR890004695B1 - Method of connecting an expansion joint - Google Patents

Abstract

The expansion joint is connected by filling polymer composite material as finishing and back filling material in a gap between two spaced sections of surface layer laid on a support layer. The polymer composite material is consisted of binder such as polymer and/or reactive polymer emulsion as polymer matrix and water hardenable material which react with water from reactive polymer emulsion. After curing the back filling material, the ratio between bending strength and compression strength is in the range of from 1:5 to 1:2.

Description

Construction method of telescopic connection device

The present invention relates to a method for constructing a flexible connecting device using a composite material having a polymer-reactive resin emulsion in a metric form as an end member and a back filling material in the construction of a flexible connecting device such as a road, a bridge, and a railway. will be.

In general, the flexible connecting device is constructed so that both sides are supported by anchors and the like at the cutout portions of the opposite top plates, and are positioned between the opposite top plates. In the construction of this expansion and contraction device, cement concrete is commonly used as the end member or the backfill material at the top plate end.

Although the performance of cement concrete differs depending on the proportion of the composition to be blended, the performance of cement concrete generally used as civil engineering material is about 15 to 23㎏ / ㎠ when the compressive strength is 200 to 300㎏ / ㎠. The bending strength is about 28 to 42 kg / cm 2 and about 1/13 and 1/7, respectively. In the end member and the backfill material in the construction of the flexible connection device, the tensile strength and the bending strength with respect to the compressive strength, especially the bending strength, are required to be strengthened in nature because of the synthetic stress of tensile and compression.

Therefore, the design ignores the strength other than compressive strength and uses it with reinforcing materials such as rebar, PC steel bar and steel fiber.

In order to improve the strength of cement concrete for this reason, polymer cements containing polymers such as SBR as a modifier of cement have been proposed and used for interior and exterior of buildings. Since the tensile strength and the bending strength are improved by only about 2 to 3, the end member and the backfilling material during the construction of the telescopic connection device are not necessarily sufficient.

In addition, resin concrete in which dry aggregate is mixed with epoxy and unsaturated polyester resin having sufficient bending strength as a binder has been proposed and used. However, there is a problem in cost and workability and a drastic decrease in performance in construction under wet surface. There is a disadvantage.

Thus, when considering materials with potential for strength improvement, there are emulsions of various polymers, prepolymers, monomers, and reactive resins, but the materials of this system are not only polymerized but also solidified by volatilization of water. As a result, it is not suitable as an end member or a backfill material of a flexible connection device in a thick plate or the like, and is only practically used as a thin film as an emulsion paint.

In view of this, in order to overcome the drawbacks of the existing materials, the present invention has examined new emulsion concrete and emulsion mortar. As already explained, cement concrete is weak in tension, so it is less resistant to impact force (the tensile stress acts as a reaction against instantaneous compressive stress).

The present invention is a composite material in which the material used as the end member and the backfill material is hydrated in a binder having a polymer reactive resin emulsion as a matrix, and a hydraulic material such as cement is used as an internal fire extinguishing agent for water, and the bending strength after hardening is further enhanced. It is to provide a construction method of the flexible connection device using the end member, the back-filling material to withstand the repeated impact caused by severe wheel load by being able to withdraw even in the case of large-scale construction. In the present invention, a polymer reactive resin emulsion means a polymer or / and a reactive resin emulsion.

The present invention uses a polymer-reactive resin emulsion as a matrix so that the composite is cured without volatilization of water. However, when a hydraulic material such as cement is mixed as a water extinguishing agent, a surplus water is consumed in the hydraulic material to form a hard emulsion cured product. The bending strength with respect to the solidification due to the hydration of the material and the compressive strength of the material becomes larger than before, so that the ratio of the bending strength and the compressive strength is 1: 5 to 1: 2.

Also, because it is a material used for water, there is no need for drying process of aggregate, and it is not necessary to secure dry surface even when pouring as end member or backfilling material. This is possible and can be carried out by construction management homogeneous with cement concrete.

The polymer / reactive resin which is a component of the emulsion commonly used in the present invention includes epoxy resin, SBR, EVA, polyacid resin, asphalt and the like.

Next, an Example and a comparative example demonstrate this invention further more concretely.

Example 1

Cement 235

Reactive Emulsion 190

Water 25

Fine sand 590

Rough aggregate 1200

Example 2

Mortar 315

Reactive Emulsion 250

Water 25

Fine sand 630

Coarse Sand 880

Comparative Example 1

Cement 330

SBR 45

Water 150

Fine sand 868

Rough aggregates 868

Comparative Example 2

Cement 303

Fine sand 232

Coarse Sand 553

Aggregate aggregates 1064

Water Resistant 0.8

Comparative Example 3

Epoxy resin (trade name Shobondo # 505) 250

Fine sand 750

Rough aggregate 1250

Example 1 and Example 2 are both examples of the composite material of the present invention, in which the reactive resin is a mixture of a liquid containing epoxy resin as a main component and a liquid containing polyamide as a main component in a ratio of 8: 2. .

Comparative Example 1 is a polymer cement-based composite material and is mainly used as interior and exterior building materials and cosmetic flooring material. This system uses polymer emulsion as a modifier of cement, and the addition amount is usually about 10 to 30% with respect to cement, and is about 50 at most. Since this system uses a solidification system for volatilization of water contained in the emulsion, the polymer of the emulsion is selected from thermoplastic resins such as SBR, EVA, and acrylic, and is used for flooring and interior and exterior materials. . Comparative Example 2 is an example of ordinary cement concrete and Comparative Example 3 is an example of resin concrete. In addition, the unit of a component of both an Example and a comparative example is kg / m <^3> .

Next, Table 1 shows the contrast between the Examples and Comparative Examples.

TABLE 1

As apparent from Table 1, the emulsion concrete emulsion mortars of Examples 1 and 2 in which the polymer and the water-insoluble resin emulsion were in matrix form were prepared by combining the polymer and the water-soluble material in the binder having the polymer and the water-insoluble resin emulsion in the matrix form. As the extinguishing agent of water contained in the water-soluble resin emulsion, the mixture was mixed so that the ratio of the bending strength and the compressive strength after curing was about 1: 5 to 1: 2, so that the ordinary polymer cement concrete of Comparative Example 1 and Comparative Example 2 Compared with cement concrete, the bending strength with respect to the compressive strength can be enhanced, and it is comparable to the ratio of the compressive strength and the bending strength in the resin concrete of Comparative Example 3.

In addition, when the stress and strain curves are taken, the elastic performance values shown in Table 1 are obtained, but the embodiment of the present invention having improved tensile properties also has a large amount of tensile distortion. In other words, this suggests that it can withstand repeated shocks as a component of elastic strength.

Therefore, the composite material containing the polymer and semi-insoluble resin emulsion in the form of a matrix, and the hydraulic material as a water extinguishing agent, has a higher bending strength than conventional cement concrete, and is used as an end member or backfilling material in the construction of a flexible connection device. It is possible to use one-time pouring or filling irrespective of the thickness of the casting rather than using it as a thin film like the emulsion paint.

As described above, the present invention can be carried out by the same level of management method as the construction by cement concrete, and the construction method of the excellent new connection device using the end member or the back filling material by the composite which increased the bending stress which is the synthetic stress of tension and compression. To provide.

Claims (1)

A hydraulic material is mixed into the binder having a polymer-reactive resin emulsion matrix as an internal extinguishing agent of water contained in the polymer-reactive resin emulsion, and mixed so that the ratio of bending strength and compressive strength after curing is 1: 5 to 1: 2. A method of constructing a telescopic connection device, characterized in that the use of a composite material as an end member or a back filling material enables one time pouring and filling regardless of the thickness of the filling part.